feat: Get evaluation working.

HepLean/Tensors/ComplexLorentz/Basic.lean

@@ -143,6 +143,14 @@ def complexLorentzTensor : TensorSpecies where
     | Color.downR => 2
     | Color.up => 4
     | Color.down => 4
+  repDim_neZero := fun c =>
+    match c with
+    | Color.upL => inferInstance
+    | Color.downL => inferInstance
+    | Color.upR => inferInstance
+    | Color.downR => inferInstance
+    | Color.up => inferInstance
+    | Color.down => inferInstance
   basis := fun c =>
     match c with
     | Color.upL => Fermion.leftBasis

HepLean/Tensors/ComplexLorentz/Lemmas.lean

@@ -146,6 +146,9 @@ lemma symm_contr_antiSymm {S : (Lorentz.complexCo ⊗ Lorentz.complexCo).V}
   rw [antiSymm_contr_symm hA hs]
   rfl
 
+lemma contr_rank_1_expand (p : Lorentz.complexCo) (q : Lorentz.complexContr) :
+    {(p | μ ⊗ q | μ) = p | 0}ᵀ := by
+  sorry
 end Fermion
 
 end